public class Example4_19 {
   public static void main(String args[]) {
     Student zhang = new Student();
     Student geng = new Student();
     zhang.setAge(23);
     System.out.println("zhang的年龄:"+zhang.getAge());
     geng.setAge(25);
     System.out.println("geng的年龄:"+geng.getAge());
   }
}
